Observations of anomalous oceanic crust in the Canada Basin, Arctic Ocean

Details Observations of anomalous oceanic crust in the Canada Basin, Arctic Ocean Observations of anomalous oceanic crust in the Canada Basin, Arctic Ocean

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.134...99j&link_type=abstract

Earth and Planetary Science Letters, vol. 134, Issue 1-2, pp.99-106

Computer Science

1

Scientific paper

We present a seismic reflection frofile and coincident refraction data in deep water north of the Northwind Ridge, in the Canada Basin. The reflection profile shows a package of bright events, which are locally nonparallel and discontinuous, about 2.5 s below the seafloor. These bright reflectors are of interest because previous reflection profiles in the Canada Basin have not penetrated the coherent flat-lying events, which are typical of bedded sedimentary rocks. These prominent reflections are recorded on the refraction profile as wide-angle reflections, and the locally nonparallel and discontinuous event as a refraction. On the refraction profile the nonparallel and discontinuous event exhibits lower frequencies and has an associated refraction with a velocity of 4.5 km/s and a high gradient. This event is interpreted as representing the top of oceanic layer 2, which is observed for the first time in the Canada Basin. Three kilometres beneath layer 2 a velocity of 7.2-7.5 km/s is measured. This layer could represent either a high-velocity layer 3 or serpentinized mantle. Based on comparison with the eastern Grand Banks and the west Iberian and Labrador Sea margins the interpretation of serpentinized mantle is preferred.

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